http_filter: add addEncodedTrailers and addDecodedTrailers#3980

Merged

mattklein123 merged 20 commits intoenvoyproxy:masterfrom

snowp:add-trailers

Aug 14, 2018

Commits on Jul 28, 2018

http_filter: add addEncodedTrailers
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mock out new method
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Commits on Jul 31, 2018

add addDecodedTrailers and use move semantics
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Commits on Aug 2, 2018

only allow trailers added in decodeData(true)
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Commits on Aug 3, 2018

throw exceptions on bad access + add comments
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Commits on Aug 7, 2018

return by reference, throw exception on invalid usage
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expect exception in encode/decodeTrailers + add @throws comment
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asserts instead of exceptions
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Commits on Aug 8, 2018

add integration test for addEncodedTrailers
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fix addDecodedTrailers
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only check for upstream trailers when upstream supports trailers
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Commits on Aug 9, 2018

only execute callback for filters after filter that added trailers
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also keep track of filter for decode
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test adding trailers in integration_test.cc
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fixup comments
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formating
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Commits on Aug 10, 2018

remove debug line
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add @return comments
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Commits on Aug 13, 2018

update comments and other feedback
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Commits on Aug 14, 2018

add const qualifier and update comment
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